The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 28, 1986
Filed:
Sep. 13, 1985
Applicant:
Inventor:
Hans Erdmannsdorfer, Ludwigsburg, DE;
Assignee:
Filterwerk Mann & Hummel GmbH, Ludwigsburg, DE;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B01D / ;
U.S. Cl.
CPC ...
55486 ; 55498 ; 55521 ;
Abstract
A dual-element disposable filter cartridge for air intake filters of machines operating in a dusty environment, the filter cartridge having a second pleated filter element arranged concentrically inside a first pleated filter element, the filtering paper of the second filter element, in comparison to the filtering paper of the first filter element, having a fractional effective surface area, a lesser density and a heavier gauge with wider and longer flow passages or pores which, due to the higher air flow speed therethrough, trap dust particles which, in the new state of the filter cartridge, pass through the outer filter element.